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On my humorlab.com site I have a "tell a friend" button on each page. This opens a page where my visitors can enter in their email and that of their friends - then press submit and have an emial sent to each of their friends about that particular page.

I would like to add 2 checkboxes to my form - one will subscribe the visitor to a netezines.com humor newsletter - the other to subscribe them to my own site news letter.

You shouldn't need three forms to do this. One form should do it. I assume you're using some type of scripting language to handle the form? If so, just check to see if the checkboxes are checked, and include code or another file to handle setting up the newsletter (add user to the database, send them an email, etc.).